10Where any combination of old and new sentences is to run consecutively in relation to a prisoner and—
(a)the last of those sentences is a new sentence, he shall, in addition to any supervised release order or licence period, be subject to the new provisions in relation to that new sentence; and
(b)the last of those sentences is an old sentence, he shall, in addition to any supervised release order or licence period, be subject to the existing provisions in relation to that old sentence.